// Copyright 2019-2024 Xu Ruibo (hustxurb@163.com) and Contributors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package vectormap

import (
	"unsafe"

	"github.com/zuoyebang/bitalostored/butils/vectormap/manual"
)

const bufferSize = int(unsafe.Sizeof(Buffer{}))

type Buffer struct {
	buf []byte
	ref refcnt
}

func (b *Buffer) acquire() {
	b.ref.acquire()
}

func (b *Buffer) release() {
	if b.ref.release() {
		b.free()
	}
}

func (b *Buffer) free() {
	n := bufferSize + cap(b.buf)
	buf := (*[manual.MaxArrayLen]byte)(unsafe.Pointer(b))[:n:n]
	b.buf = nil
	manual.Free(buf)
}
